Alright, let's work through 1804 times 638 step by step
1804 × 638 = 638 × (1804)
+ 638 × 4 that is equal 2552
+ 638 × 00 producing 0
+ 638 × 800 that equals 510400
+ 638 × 1000 giving us 638000

= 1150952
